feat: Use subscripts for small amounts

[Signor1]

Closes #951

Description

This PR implements subscript notation for displaying very small amounts (e.g., 0.0₅1 instead of 0.000001) across the Mobile Wallet, Desktop Wallet, and Explorer. This improves readability for token amounts with many leading zeros.

Changes

• Implemented standard subscript formatting utilities in the shared package.
• Updated [formatAmountForDisplay] to support optional subscript formatting.
• Enabled subscript notation in Desktop Wallet, Mobile Wallet, and Explorer Amount components.
• Added specific styling for subscript characters (secondary font color) in Desktop and Explorer.
• Added comprehensive unit tests for the new formatting logic.

Verification

• Unit tests passed (pnpm test packages/shared)
• Linting and Typechecking passed (pnpm check)
• Visual verification in Desktop, Mobile, and Explorer

[changeset-bot]

🦋 Changeset detected

Latest commit: d580a2b

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 6 packages

Name	Type
@alephium/shared	Minor
alephium-desktop-wallet	Minor
@alephium/mobile-wallet	Minor
@alephium/explorer	Minor
@alephium/keyring	Patch
@alephium/shared-react	Patch

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[nop33]

Hello, I'm back from my holidays!

Very good job 👏
I'll do some functional tests next, in the meantime would you mind having a look at the small comments I have?

[Signor1]

Hello, I'm back from my holidays!

Very good job 👏 I'll do some functional tests next, in the meantime would you mind having a look at the small comments I have?

Welcome back @nop33 !

I have made the corrections

[nop33]

Thanks for the reply!

One issue I found when testing the apps is that the color fo the subscript doesn't follow the color of the rest of the amount text. The following screenshot is an example of the transactions list amounts in the desktop wallet. Since it's an incoming transaction, the wallet changes the color of the amount to green, but the subscript amount remains gray. Could you please have a look?

PS: On mobile wallet it seems that it works correctly

[Signor1]

Hi @nop33 , I have update the color to inherit the parent's

[nop33]

Thanks a lot for this contribution!

[Signor1]

Thanks a lot for this contribution!

It's always a pleasure!